[Numpy-discussion] fftshift

Pearu Peterson pearu at cens.ioc.ee
Thu May 29 13:48:02 CDT 2003


On Thu, 29 May 2003, Cliff Martin wrote:

> This leads me to my second problem.  In Matlab there is a function 
> called fftshift that lets one shift the fft values for more easy 
> visualization.  Numeric doesn't seem to have a function like that 
> explicitly although I suppose one could use the flip function in the 
> MatPy module.  Has anyone implemented something like the fftshift 
> function or could you suggest the best way to do this?  Thanks for your 
> help.  Oh I'm doing this on a 2D array.

scipy.fftpack has fftshift. If you don't care building scipy
yourself then the implementation of fftshift can be viewed via
CVSview at www.scipy.org, look at the file
  scipy/Lib/fftpack/helper.py

HTH,
	Pearu





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